Alarm Function: The power failure alarm is primarily used for power failures. An alarm is connected in parallel with an outdoor wire or meter. The product will immediately report to you if the wiring is disconnected or the meter is damaged, providing a warning. Stable Operability: The automatic power failure alarm charger can use regular batteries and rechargeable batteries. When using rechargeable batteries, the standby life can be up to 10 years, which can prevent false alarms that are not detected due to faults. Wide Compatibility and Application Voltage: The exquisite design of the power failure alarm allows this product to be used for a long time under AC175V ~ 265V voltage. Its compatible design can be used not only in urban areas but also in suburbs where voltage is less stable. The humanized design offers great convenience. Standby Time and Durability: The fault alarm uses two batteries: a regular GF22 and a rechargeable one. Regular batteries can be used for about 2 years, while rechargeable batteries can be used for a long time. Rechargeable batteries can be recycled for about 10 years. Wide Range of Applications: Fault alarms are suitable for computer rooms, power distribution boxes, substations, household electrical wiring inputs, etc., and can locate stolen electrical wiring or appliances.